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#include <2geom/piecewise.h>
#include <2geom/sbasis.h>
#include <2geom/bezier-to-sbasis.h>
#include <toys/path-cairo.h>
#include <toys/toy-framework-2.h>
using namespace Geom;
class PwToy: public Toy {
public:
vector<PointSetHandle*> pw_handles;
PointSetHandle slids;
void draw(cairo_t *cr, std::ostringstream *notify, int width, int height, bool save, std::ostringstream *timer_stream) override {
cairo_set_source_rgba (cr, 0., 0.5, 0, 1);
cairo_set_line_width (cr, 1);
D2<Piecewise<SBasis> > pws;
for(unsigned i = 0; i < pw_handles.size(); i++) {
D2<SBasis> foo = pw_handles[i]->asBezier();
cairo_d2_sb(cr, foo);
for(unsigned d = 0; d < 2; d++) {
pws[d].cuts.push_back(150*i);
pws[d].segs.push_back(foo[d]);
}
}
for(unsigned d = 0; d < 2; d++)
pws[d].cuts.push_back(150*pw_handles.size());
slids.pts[0][1]=450;
slids.pts[1][1]=450;
slids.pts[2][1]=450;
slids.pts[3][1]=450;
cairo_set_source_rgba (cr, 0.2, 0.2, 0.2, 1);
D2<SBasis> foo = slids.asBezier();
SBasis g = foo[0] - Linear(150);
cairo_d2_sb(cr, foo);
for(unsigned i=0;i<20;i++){
double t=i/20.;
draw_handle(cr, foo(t));
}
cairo_stroke(cr);
foo[1]=foo[0];
foo[0]=Linear(150,450);
cairo_d2_sb(cr, foo);
cairo_d2_pw_sb(cr, pws);
cairo_stroke(cr);
cairo_set_source_rgba (cr, 0.9, 0., 0., 1);
D2<Piecewise<SBasis> > res = compose(pws, Piecewise<SBasis>(g));
cairo_d2_pw_sb(cr, res);
for(unsigned i=0;i<20;i++){
double t=(res[0].cuts.back()-res[0].cuts.front())*i/20.;
draw_handle(cr, Point(res[0](t),res[1](t)));
}
cairo_stroke(cr);
Toy::draw(cr, notify, width, height, save,timer_stream);
}
bool should_draw_numbers() override { return false; }
public:
PwToy () {
unsigned segs = 5;
unsigned handles_per_seg = 4;
double x = 150;
for(unsigned a = 0; a < segs; a++) {
PointSetHandle* psh = new PointSetHandle;
for(unsigned i = 0; i < handles_per_seg; i++, x+= 25)
psh->push_back(Point(x, uniform() * 150));
pw_handles.push_back(psh);
handles.push_back(psh);
}
for(unsigned i = 0; i < 4; i++)
slids.push_back(Point(150 + segs*50*i,100));
handles.push_back(&slids);
}
};
int main(int argc, char **argv) {
init(argc, argv, new PwToy());
return 0;
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=4:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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